Final answer:
Starchy potatoes like Russet or Idaho, and waxy potatoes like red or Yukon Gold, are commonly used for roasters.
Step-by-step explanation:
There are different types of potatoes that are used for roasting. Starchy potatoes, such as Russet or Idaho potatoes, are commonly used for roasters. These potatoes have a high starch content and low moisture, which makes them perfect for baking or mashing. On the other hand, waxy potatoes, like red or Yukon Gold potatoes, are more suitable for recipes where the potatoes need to maintain their shape, such as potato salads or soups.